Re: [PATCH 03/35] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET)
From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
Date: 2022-02-08 22:34:09
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On Mon, 2022-02-07 at 14:45 -0800, Dave Hansen wrote:
Please add a chunk to the changelog that explains the dependency.
This
would suffice:
To protect shadow stack state from malicious modification,
the
registers are only accessible in supervisor mode. This
implementation context-switches the registers with XSAVES.
Make
X86_FEATURE_SHSTK depend on XSAVES.Thanks. Yea, I don't think that part of the design is really elaborated on anywhere. It can be some foreshadowing for the signal stuff later too.